Robin's History
For many years, Richard "Dick" Grayson was Batman's sidekick Robin.
The name "Robin the Boy Wonder" and the medieval look of the original costume were inspired by the legendary hero Robin Hood, as well as the red-breasted American Robin, which continued the "flying animal" motif of Batman.
Young Dick Grayson was born on the first day of spring. His mother nicknamed him "little Robin". Little did she know how prophetic this term of endearment would be in her son's life.
Dick Grayson was a twelve-year-old Romany circus acrobat, the youngest of a family act called The Flying Graysons of The Haley Circus. Dick joined the act at a very young age, having been trained in acrobatics from birth. Before one appearance in Gotham, in which The Flying Graysons were the main attraction, they were asked to pose for a photo opportunity with the Drake Family, including their young son Tim Drake. From that time on Tim's one and only hero in the world was Dick.
While on tour in Gotham City, he overheard "Boss" Tony Zucco, a well-known and feared crime-lord, threaten the performers unless the circus's owner paid extortion money. The owner refused, and that night Dick watched in horror as his parents' high wire snapped, sending his parents hurtling to their deaths, all while many of Gotham's elite watched on. Young Dick felt responsible, because he didn't warn his parents in time.
Beginnings
Shortly after the tragedy, as shown in Batman: Year Three and Year One Annual: Robin, Dick was placed in an uncaring juvenile services system, on the grounds that social services was full. He got beaten up by a number of the inmates, and he was later sent to a Catholic orphanage. Bruce Wayne rescued Dick by adopting him as his ward, because the boy did not want to replace his deceased father with the billionaire. In Batman: Dark Victory, frustrated by the lack of attention from his new guardian and the mystery still surrounding his parents' death, Dick sneaked out of Wayne Manor one evening to solve the crime on his own - only to stumble into Batman, who was also investigating the murder. When Dick returned to the circus, he was confronted by Zucco's business associate, Eddie Skeevers who nearly killed Grayson, but Dick was saved thanks to Batman's intervention. After waking up in the Batcave, he is shocked to learn that Bruce is really the Batman. They succeed in revealing Zucco's complicity, but he supposedly dies of a heart attack before his arrest. Seeing a reflection of himself in Dick; that he could temper compassion with a thirst for justice, Batman made the young orphan the offer of a lifetime; the chance to become his crime-fighting partner. Dick chose the name Robin, and his training began. Dick's first mission alongside the Dark Knight involved battling The Hangman in Gotham's sewers, and then Two-Face and the rest of Batman's Rogues Gallery at the Batcave. They swore an oath late that night that they would fight together against crime and corruption, never swerving from the path of righteousness. Batman had realized for the first time that he did not have to be alone in his crusade.
Robin's origin had a typological connection to Batman's in that both witnessed the crime-related deaths of their parents, creating an urge to battle the criminal underworld. This provided a bond and understanding between the two.
Bruce taught Dick fighting techniques and detective skills for a grueling 6 months. Finally, Dick had to pass a final test - "the Gauntlet". Dick had to elude the Dark Knight on the streets of Gotham for one night - from sunset to sunrise - without any outside help. Dick succeeded, simultaneously bringing Gotham gangster Joe Minette to justice. Dick took to the streets as Batman's full-fledged partner in crime-fighting: Robin, the Boy Wonder.
Early adventures
Dick enjoyed his first year as Robin, regarding the job as an adventure until a confrontation with Two-Face served as a rude awakening for the young hero. Two-Face had captured the new District Attorney and Batman, and had each suspended from a hangman's noose in a 'double gallows death-trap'. Robin, in trying to save the D.A., used a batarang to cut the rope of the noose. It worked, but Robin didn't account for Dent's obsession with the number two -- it was a two-fold trap, and the floor gave way, dropping the D.A. into the water, where the man drowned. Robin was unable to prevent his death, and received a beating at the hands of Two-Face. A beating witnessed by Batman, still tied up on the platform trying to free himself. Eventually, Batman was able to free himself and apprehend Two-Face. This event, however, scarred the young crime-fighter, and haunts him even today. Rather than see Dick be further endangered, Batman "fires" his partner, sidelining the Boy Wonder for a time.
Teen Titans
The formation of the Teen Titans mainly happened due to the sidekick's mentors making them feel lesser of themselves, which they quickly knew wasn't right about them. Dick, along with Wally West (Kid Flash), and Garth (Aqualad) teamed-up; later on, Donna Troy (Wonder Girl) joined the team along with Roy Harper (Speedy).
Together, they cured the heroes from their mind control; later, their mentors (Batman, Flash, Aquaman, and Wonder Woman) supported the idea of the teens becoming a heroic group, the Teen Titans! Dick became the leader of this team.
Eventually, the team would disband when they grew older.
Flying solo and The New Teen Titans
Dick continued his adventures with Batman, and began attending college at Hudson University. Robin started to take on solo missions as well, and found himself to be a capable crime-fighter in his own right. Shortly afterward, the mysterious Raven summoned Dick Grayson, and several other young heroes, to form a new group of Titans. Robin again resumed leadership, and moved out of the shadow of the Batman.
Independence
When Robin was 17, he was shot in the shoulder by the Joker, and this scared Batman into ending his career for good. Dick realized at that point that he had grown up: he no longer relied on Batman and, in fact, he and the Dark Knight disagreed on crime-fighting methodology. His new-found independence and Titans' duties in New York left less time for his former commitments in Gotham City. He also dropped out of Hudson after only one semester.
Dick rediscovered his self-worth among the Teen Titans. Batman, however, was less than pleased. He informed Dick that if he no longer wanted to be his partner, then Dick would have to retire as Robin. Dick left Wayne Manor after this fallout. Helping him through this difficult time was his fellow Titans, including Starfire, a beautiful alien Dick had fallen in love with. Dick handed over leadership of the Titans to Wonder Girl.